One of the best stories is found in the fifth story. What I liked about it was that in the story we get flash backs of the time in Batman's life when as a young man he travelled the world learning all the skills he needed to learn. The story was about when Batman is injured and needs to call Alfred, his Butler, to pick him up. As Batman made his way to the point in the sewer he would rendevous with Alfred, Batman has flashbacks to the time he went to a woman somewhere in Asia to learn how to control pain. While Batman was interested in learning how to control physical pain but his teacher's goal was trying to teach him how to handle and heal the trauma that drove him to become Batman. When he had learned what he came for, Batman's teacher sent him away but she said that she failed to help him.
Below is a clip of the last two minutes in the story when Batman reaches the point he is supposed to meet Alfred he finds a bunch of illegal guns strewn about the sewer tunnel. Batman tries to gather the guns in his arms when Alfred reaches down from the street level so Batman can take his hand and be saved, Batman says "I can't." Why? Because he cannot let go of the guns. The guns represent the trauma that birthed Batman - the death of the Waynes, his parents gunned down in front of him as a child. That is great illustration of how in the depths of emotional pain we sometimes hold on to the pain instead of letting it go and being free of it.
One of the best things about art like this is that it lends itself to multiple interpretations and views. Feel free to leave yours in the comments. Also check the links below to stream the movie and the Wikipedia article for more information.